Who is The Wolperts from Sacred Hunger and what is their importance?

Mr. and Mrs. Wolpert are not too excited to have Erasmus as a suitor for their daughter. Sarah is not yet eighteen, and Erasmus's intense personality causes them some weariness. The fact that William Kemp gives Erasmus his blessing causes Mr. Wolpert to hire a man to look into Kemp's financial dealings, for Wolpert believes that to be the true reason for his blessings on this marriage. When Kemp dies and his debt is found out, he offers Erasmus a job with the family business. When Erasmus does not accept the offer, he forbids Erasmus' marriage to his daughter Sarah.